Hayut was appointed judge of the Tel Aviv Magistrates Court in March 1990, acting judge of the Tel Aviv District Court in October 1996, and judge of the Tel Aviv District Court in September 1997. She served as an acting justice of the Supreme Court from March 2003 and as justice of the Supreme Court of Israel since May 2004. Hayut was unanimously elected to replace
Miriam Naor as the Chief Justice of the Supreme Court in 2017 according to the seniority method used in Israel. In January 2023, Hayut spoke against
proposed judicial reforms, calling them "an unbridled attack ... a plan to crush the judicial system" at a conference of the Israel Association of Public Law. On 1 January 2024, the Supreme Court led by Hayut, issued a narrow 8-to-7 decision, that the Knesset law blocking the court's use of the "reasonableness" doctrine was unconstitutional, overturning the law—thus self-validating, reasserting and reinforcing the court's own authority to use the "reasonableness" standard, at its discretion, to review and overturn Knesset-passed laws. At the same time, by a broad 12–3 majority, the Supreme Court ruled that it had the right to review any Knesset-passed Basic Law, and decide on its constitutional legitimacy.
Uzi Vogelman was expected to become president in 2023 following Hayut's retirement until his own retirement a year later, but due to the short term he would serve, he indicated he would decline the position. Nevertheless, as Deputy President of the Supreme Court, Vogelman became acting president on 16 October 2023. Hayut's first public remarks since retiring were made in 2024, where she expressed concerns about the
government led by
Netanyahu desires to try again to pass judicial reform laws. She also raised concerns about threats to the independence of several important institutions, including the judiciary, universities and the media. == Awards ==